Double Storey Extensions

What is a Double Storey Extension?

A double storey extension is basically a two storey extension built to extend the size of your house and your living space on two floors – a ground and first floor. View Double Storey Extension Ideas.

Double storey extensions or 2 storey extensions create the most space in your home, giving twice the space of other types of extension. 2 storey extensions open up a huge amount of space (whether as a side return, rear or wrap-around extension) as they run across two floors, allowing families an increase in their living space as well as additional room upstairs for an extra bedroom or perhaps an en suite for the master bedroom.
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Grow your house with your family

As your family grows, you may find yourself needing more space than your house can accommodate. However, moving house can be expensive and stressful, with high competition for every single property. A double storey extension allows you to create more space both upstairs and downstairs, as well as adding value to your property overall. So the cost of a double storey extension might be daunting at first, but it’s always worth it.

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Double Storey Extension Ideas

Upstairs, downstairs

Double Storey Extension Ideas – Downstairs
The downstairs portion of your double storey extension will allow you to create a fantastic living space with all the room you could need. A 2 storey extension will allow you to have an open plan kitchen with all of the luxuries of high-spec appliances and a bespoke design, that’s perfect for entertaining. You could even incorporate a dining area or living area, with bi-fold doors opening out on to your garden or patio. This is just the tip of the iceberg when it comes to 2 storey extension ideas, so just take a look at our portfolio for more amazing ideas.

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2 storey extension
Double Storey Extension Ideas – Upstairs
Ideas for the upstairs of the double storey extension, meanwhile, will offer space for an extra bedroom or two, so whether that’s a bigger bedroom for a growing child or a brand new room to act as a baby’s nursery, you can get the space you need without looking for a whole new house. If you don’t need a new bedroom, but just want to ease bathroom traffic in the morning, you could use your double storey extension to create an en suite on an existing bedroom.

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Double Storey Extension Semi Detached House

A double storey extension for a semi-detached house is an easy job, and is our most common house type we work on. A double storey extension semi detached house can give you close to twice the amount of space compared to a standard semi detached house size. However, you don’t need a big 2 storey extension semi detached house to free up a lot of room as you are able to add a great deal of extra storage or living space upstairs and downstairs.

Double Storey Extension Terraced House

Just because you live in a terrace house doesn’t mean you can’t invest in a double storey extension. A double storey extension terraced house is the perfect way to increase the length and space of your home allowing you to create an enormous living space.

You can extend the dining room and kitchen downstairs into a long entertaining area and upstairs of the double storey extension terraced house can be used to create an extra bedroom, storage room, bathroom or any other room you have an idea for.

Double Storey Garage Extension

Have another idea? Well a double storey garage extension is a completely viable extension to invest in. Have space at the side of your home above the garage where you want to extend to? Then this can be done and can free up tons of space upstairs. A double storey garage extension doesn’t always have to be on the side of the house, but this is a typical double storey side extension that many people invest in because this allows you to use up the wasted space above your garage.

Add value

A double storey extension will hugely increase your living space, adding value to your house and making it much more competitive in the housing market. So if you decide to move in the future – perhaps at a point where you want to downsize – you’ll be able to market your house at its maximum value with the addition of a 2 storey extension.

How Much Does A Double Storey Extension Cost?

A double storey extension costs more than a single storey extension due to the extra building costs and materials needed to produce close to twice as much work. A 2 storey extension can cost from £75,000 depending on the scale of the project (London based pricing). But if you want to know how much is a double storey extension for your build, ask us for a Free Quote and we’ll get a price to you along with bespoke design & planning for your project.

Double Storey Extension Cost
Approximate Cost*
From £75k Upwards


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Get in touch with the team at Simply Extend today to find out how we can help you realise your dream home and arrange your free site visit.

Also you can now download this handy pdf guide to house extensions

Do you need planning permission for double storey extension?

Yes, you will need planning permission for a double storey extension from your local building authority. There are no permitted development regulations for double storey extensions. It is unlikely that you will be able to have a double storey extension if your home is in a conservation zone.

How much will a 2 storey extension cost?

A double storey extension will cost approximately £40k more than a single storey extension. This will vary based on the size of the extension and the choice of fittings, including glazing. The current cost of materials will also influence the cost heavily.

How much does a double storey extension cost UK?

The cost of a double storey extension depends on the size of the extension. Your local planning authority, typically the local council, will decide how big your extension can be, and this will dictate a rough cap to the cost for your extension project.

Is double storey more expensive?

Due to the quantity of materials needed, a double storey extension is more expensive than a single storey extension. The average double storey extension will add an additional £40k to the ground floor extension cost, but this depends on the size of the extension.

Can you do a two storey extension?

A two-storey extension will always require planning permission and will depend on the location of your home. Your local building authority will ultimately decide if you can have a double-storey extension. It is unlikely to be permitted in a conservation area.

what is a double storey extension?

A double storey extension is an extension to the property of two levels. Typically, this extension will create an additional room on the ground floor of the house, with a new room being built directly on top of it, connecting to the rest of the first floor.

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